Permanent magnet direct-drive bogie and rail vehicle thereof

ABSTRACT

A permanent magnet direct-drive bogie and a rail vehicle thereof are disclosed. The permanent magnet direct-drive bogie comprises a frame (1), a wheel set (2), and a permanent magnet motor (3); the frame (1) comprises a longitudinal beam (11), a cross beam (12) perpendicular to the longitudinal beam (11), and end beams (13) arranged at both ends of the longitudinal beam (11); a hollow shaft (4) is sleeved on an axle (21) of the wheel set (2), a force transmission seat (5) is fixed on the axle (21), the permanent magnet motor (3) is sleeved on the hollow shaft (4), one end of the hollow shaft (4) is connected to the permanent magnet motor (3) through a flexible coupling (6), and the other end of the hollow shaft (4) is connected to the force transmission seat (5) through a flexible coupling (6); both longitudinal sides of the cross beam (12) are provided with protrusions (121); the permanent magnet motor (3) is flexibly connected to the frame (1) through a swing rod (7) and a suspension rod (17), one end of the swing rod (7) is hung on the protrusion (121), the other end is connected to a housing of the permanent magnet motor (3), and the axis of the swing rod (7) is arranged longitudinally; one end of the suspension rod (17) is connected to the housing of the permanent magnet motor (3), and the other end is suspended on the end beam (13); and the permanent magnet motor (3) is laterally movable.

INCORPORATION BY REFERENCE TO ANY PRIORITY APPLICATIONS

Any and all applications for which a foreign or domestic priority claimis identified in the Application Data Sheet as filed with the presentapplication are hereby incorporated by reference under 37 CFR 1.57.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention belongs to the field of rail vehicles, andspecifically relates to a permanent magnet direct-drive bogie and a railvehicle thereof.

Description of the Related Art

At present, high-speed locomotives at home and abroad, which use drivesystems with gear transmissions, have the problems of complex structure,large transmission loss and low reliability, and especially it isdifficult to solve the lubrication and sealing problems in high-speedoperation. At the same time, the high-speed locomotives also have theproblems of high noise, high maintenance cost, etc.

With the advancement of permanent magnet motor technology, direct driveis increasingly applied to rail vehicles. At present, permanent magnetdirect drive is mainly used in light rail vehicles with independentrotating wheels. The main form is hub direct drive or wheel side directdrive, in which permanent magnet motors directly drive the wheels torotate. The hub direct drive or wheel side direct drive can only be usedfor light rail vehicles because of low motor power, but cannot beapplied to high-power locomotives or Multiple Units.

Subways or EMUs also use the permanent magnet direct drive technology. Apermanent magnet motor rotor is directly mounted on the surface of anaxle, and a wheel set is directly driven to rotate through theelectromagnetic action of the stator and the rotor. For example: apermanent magnet direct-drive subway train disclosed in patentapplication CN106515750A includes a train body, and a frame device and awheel set device arranged below the train body, a permanent magnetsynchronous traction motor is mounted on an axle by journal sticking,both ends of a rotor of the permanent magnet synchronous traction motorare connected to the axle, an inner side of a stator of the permanentmagnet synchronous traction motor is connected to the frame devicethrough an elastic support device, axle-control is used in a tractionsystem matched the direct-drive permanent magnet synchronous motor, andan isolated contactor is arranged between each motor and a tractioninverter.

A motor axle-mounted permanent magnet direct-drive bogie disclosed inpatent CN204956480U includes two frame devices, two permanent magnetsynchronous traction motors, two triangular elastic support devices, andfour wheel set axle box devices; the two adjacent front and rear wheelset axle box devices are connected by a frame device, two wheels on leftand right symmetrical sides are connected by an axle, the permanentmagnet synchronous traction motors are integrated with the axle throughrotors and driven by rotating the axle; the two frame devices aresymmetrically located on the left and right sides in the advancingdirection of a rail vehicle, the two frame devices are connected by adouble traction pull rod device, and the triangular elastic supportdevices are connected to the permanent magnet synchronous tractionmotors and the double traction pull rod device.

The above patents all belong to the structural form of a direct-drivebogie, in which the motor is directly elastically or inelasticallysuspended on the axle, the mass of the permanent magnet motor isentirely the unsprung mass, the axle of the vehicle is heavy, and theunsprung mass has a great impact on vertical and lateral dynamic forcesof a wheel rail, so that it is difficult to increase the speed of thevehicle to a high speed, and the direct-drive bogie is not suitable forhigh-speed locomotives with higher speeds than EMUs. Moreover, once thespeed increases, the vibration will be greater, which will affect theservice life of the permanent magnet motor. At the same time, due to thedisadvantages of the structure designs of the above patents, thedistance between the permanent magnet motor and the frame beam is large,a long swing rod is required, and the amplitude of the permanent magnetmotor is too large during operation, so damage to the motor is easilycaused.

In addition, permanent magnet motors also have frame suspensionstructures in medium- and low-speed vehicles such as subways, lightrails or EMUs. For example: Chinese Patent CN201610304015.6 discloses aflexible frame suspended direct-drive radial bogie with a doubleT-shaped elastic hinging frame, which is mainly innovated in the doubleT-shaped elastic hinging frame with flexible function, three-point framesuspension of permanent magnet direct-drive motors, etc. However, theframe suspension is rigid frame suspension, the suspension of thepermanent magnet motors is not decoupled, and the vibration duringoperation will have an excessive impact on the permanent magnet motors.

Besides, the existing permanent magnet direct-drive bogies with hightraction points are not suitable for high-speed locomotives underhigh-power and high-traction conditions.

In addition, the terms of directions mentioned in this case are definedbelow. In the field of rail vehicles, there are usually three directionsrecognized by technicians:

Vertical: the direction perpendicular to the rail surface.

Longitudinal: the direction along the rail.

Transverse: the direction perpendicular to the rail and located on thehorizontal plane.

Locomotives are classified according to the classification standards ofspeeds in the industry: Ordinary-speed locomotives: the design speeddoes not reach 160 km/h.

Quasi-high-speed locomotives: the design speed is between 160 and 200km/h.

High-speed locomotives: the design speed is not less than 200 km/h.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention aims to provide apermanent magnet direct-drive bogie that can be applied to a high-speedlocomotive.

The technical solution of the present invention for solving the problemsis: a permanent magnet direct-drive bogie includes a frame, a wheel setarranged on the frame, and a permanent magnet motor; the frame includesa longitudinal beam, a cross beam perpendicular to the longitudinalbeam, and end beams arranged at both ends of the longitudinal beam; ahollow shaft is sleeved on an axle of the wheel set, a forcetransmission seat is fixed on the axle, the permanent magnet motor issleeved on the hollow shaft, one end of the hollow shaft is connected tothe permanent magnet motor through a flexible coupling, and the otherend of the hollow shaft is connected to the force transmission seatthrough a flexible coupling; both longitudinal sides of the cross beamare provided with protrusions;

the permanent magnet motor is flexibly connected to the frame through aswing rod and a suspension rod, one end of the swing rod is hung on theprotrusion, the other end is connected to a housing of the permanentmagnet motor, and the axis of the swing rod is arranged longitudinally;one end of the suspension rod is connected to the housing of thepermanent magnet motor, and the other end is suspended on the end beam;and the permanent magnet motor is laterally movable.

In the above solution, since the cross beam is provided withprotrusions, the distance between the cross beam and the permanentmagnet motor is shortened, the length of the swing rod is reduced, theamplitude of swinging of the permanent magnet motor during operation issmall, and the amplitude received is small.

The permanent magnet motor is supported on the frame by means of elasticframe suspension, and has sprung mass, which is conducive to thehigh-speed operation of a locomotive. In addition, the suspension of theswing rod and the suspension rod decouples the suspension of thepermanent magnet motor, there may be slight lateral displacement duringoperation, and the vertical and lateral acceleration of the wheel setcaused by the uneven line and impact will not be directly transmitted tothe permanent magnet motor, so that the working conditions are greatlyimproved. The failure rate is reduced, and the service life isprolonged. In addition, if the speed of the locomotive is higher, itsadvantages are more obvious. Moreover, the frame suspension mode of theabove solution eliminates a hollow shaft six-bar structure, and theservice life is longer.

Taken together, as the improvement on the frame structure cooperateswith the suspension structure and suspension installation of thepermanent magnet motor and the application of the coupling, the abovesolution solves a series of problems such as large vibration and largeaxle load of the permanent magnet motor applied to the high-speedlocomotive, and it becomes possible that the permanent magnet motordrives the high-speed locomotive as a power source.

Specifically, the flexible coupling is a laminated coupling; thelaminated coupling includes a first driving disc, a second driving disc,and a metal laminate; an inner sleeve of the permanent magnet motor isconnected to the first driving disc, the first driving disc is connectedto one end of the hollow shaft by the metal laminate, the second drivingdisc is connected to the other end of the hollow shaft, and the seconddriving disc is connected to the force transmission seat by the metallaminate.

The coupling with the metal laminate has a longer service life.

Preferably, the middle of the cross beam is provided with a throughhole. The through hole can reduce weight, and can also provide a largermaintenance space to facilitate maintenance.

To make the structure more stable and reliable, the outer contour of thecross beam is of an octagonal structure, and two outermost sides of theoctagonal cross beam in the longitudinal direction are the protrusions.

Further, the frame also includes end beams arranged at both ends of thelongitudinal beam, a shock absorber for damping out the vibration of thepermanent magnet motor is arranged between the permanent magnet motorand the end beam, and the angle between the axial direction of the shockabsorber and the vertical plane is more than 0 degree and less than 90degrees.

Correspondingly, the present invention further provides a rail vehicle,including a vehicle body and the above permanent magnet direct-drivebogie, the frame further includes a front end beam and a rear end beamrespectively arranged at two ends of the longitudinal beam, and a firsttraction seat is arranged at the bottom of the rear end beam; thevehicle body is provided with a traction beam, and a second tractionseat is arranged at the bottom of the traction beam; and the firsttraction seat is connected to the second traction seat by a tractionrod.

In the above solution, the traction points of the traction seats arelowered to achieve low-position traction, which reduces axle loadtransfer, improves adhesion utilization and is more conducive to ahigh-speed locomotive.

The present invention further provides another rail vehicle, including avehicle body and the above permanent magnet direct-drive bogie, a thirdtraction seat is arranged at the bottom of the protrusion on each of theboth longitudinal sides of the cross beam, and the middle of the crossbeam is provided with a through hole;

the rail vehicle further includes a traction pin, two pull rods, and afourth traction seat arranged on the vehicle body, and the fourthtraction seat corresponds to the through hole; one ends of the two pullrods are respectively connected to the third traction seats inone-to-one correspondence, the other ends are connected to the tractionpin, and the two pull rods are centrosymmetric with respect to thetraction pin;

the fourth traction seat is inserted into the through hole and connectedto the traction pin.

The rail vehicle of the above solution provides another low-positiontraction mode, the traction point is below the through hole of the crossbeam of the frame, and the “Z”-shaped double pull rod structure achieveslow-position traction, reduces axle load transfer, improves adhesionutilization, and is more conducive to a high-speed locomotive.

As the improvement on the frame structure cooperates with the suspensionstructure and suspension installation of the permanent magnet motor,low-position traction, and application of the coupling, the abovesolution solves a series of problems such as large vibration, large axleload and high traction point of the permanent magnet motor applied tothe high-speed locomotive, and it becomes possible that the permanentmagnet motor drives the high-speed locomotive as a power source. Theproblems of lubrication and sealing of the high-speed locomotive areeliminated, and the transmission loss, noise and maintenance cost of theexisting high-speed locomotive drive system are reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further illustrated below in conjunctionwith the accompanying drawings.

FIG. 1 is a front view of a bogie in Embodiment 1.

FIG. 2 is a top view of the bogie in Embodiment 1.

FIG. 3 is a front view of a bogie in Embodiment 2.

FIG. 4 is a top view of the bogie in Embodiment 2.

FIG. 5 is a partial sectional view of the bogie in Embodiment 2.

FIG. 6 is a schematic assembly diagram of a permanent magnet motor and awheel set.

FIG. 7 is a schematic hanging diagram of the permanent magnet motor.

In which: 1-frame, 2-wheel set, 3-permanent magnet motor, 4-hollowshaft, 5-force transmission seat, 6-flexible coupling, 7-swing rod,8-shock absorber, 9-vehicle body, 10-traction rod, 11-longitudinal beam,12-cross beam, 13-end beam, 14-first traction seat, 15-traction pin,16-pull rod, 17-suspension rod, 21-axle, 31-inner sleeve, 61-firstdriving disc, 62-second driving disc, 63-metal laminate, 91-tractionbeam, 92-second traction seat, 94-fourth traction seat, 121-protrusion,122-through hole, 123-third traction seat, 131-front end beam, 132-rearend beam.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Embodiment 1

As shown in FIGS. 1, 2, 6 and 7, a permanent magnet direct-drive bogieincludes a frame 1, a wheel set 2 arranged on the frame 1, and apermanent magnet motor 3. The frame 1 includes a longitudinal beam 11, across beam 12 perpendicular to the longitudinal beam 11, and end beams13 arranged at both ends of the longitudinal beam 11. The end beams 13include a front end beam 131 and a rear end beam 132. The middle of thecross beam 12 is provided with a through hole 122.

A hollow shaft 4 is sleeved on an axle 21 of the wheel set 2. A forcetransmission seat 5 is fixed on the axle 21. The permanent magnet motor3 is sleeved on the hollow shaft 4. One end of the hollow shaft 4 isconnected to the permanent magnet motor 3 through a flexible coupling 6,and the other end of the hollow shaft 4 is connected to the forcetransmission seat 5 through a flexible coupling 3. The flexible coupling6 is a laminated coupling. The laminated coupling includes a firstdriving disc 61, a second driving disc 62, and a metal laminate 63. Aninner sleeve 31 of the permanent magnet motor 3 is connected to thefirst driving disc 61. The first driving disc 61 is connected to one endof the hollow shaft 4 by the metal laminate 63. The second driving disc62 is connected to the other end of the hollow shaft 4. The seconddriving disc 62 is connected to the force transmission seat 5 by themetal laminate 63.

Both longitudinal sides of the cross beam 12 are provided withprotrusions 121. The outer contour of the cross beam 12 is of anoctagonal structure, and two outermost sides of the octagonal cross beam12 in the longitudinal direction are the protrusions 121.

The permanent magnet motor 3 is flexibly connected to the frame 1through a swing rod 7 and a suspension rod 17, one end of the swing rod7 is hung on the protrusion 121, the other end is connected to a housingof the permanent magnet motor 3, and the axis of the swing rod 7 isarranged longitudinally. One end of the suspension rod 17 is connectedto the housing of the permanent magnet motor 3, and the other end issuspended on the end beam 13. The permanent magnet motor 3 is laterallymovable.

A shock absorber 8 for damping out the vibration of the permanent magnetmotor 3 is arranged between the permanent magnet motor 3 and the endbeam 13. The angle between the axial direction of the shock absorber 8and the vertical plane is more than 0 degree and less than 90 degrees.

Correspondingly, this embodiment further provides a rail vehicle,including a vehicle body 9 and the above permanent magnet direct-drivebogie. A first traction seat 14 is arranged at the bottom of the rearend beam 132. The vehicle body 9 is provided with a traction beam 91. Asecond traction seat 92 is arranged at the bottom of the traction beam91. The first traction seat 14 is connected with the second tractionseat 92 by a traction rod 10.

Embodiment 2

As shown in FIGS. 3-7, a permanent magnet direct-drive bogie includes aframe 1, a wheel set 2 arranged on the frame 1, and a permanent magnetmotor 3. The frame 1 includes a longitudinal beam 11, a cross beam 12perpendicular to the longitudinal beam 11, and end beams 13 arranged atboth ends of the longitudinal beam 11. The end beams 13 include a frontend beam 131 and a rear end beam 132. The middle of the cross beam 12 isprovided with a through hole 122.

A hollow shaft 4 is sleeved on an axle 21 of the wheel set 2. A forcetransmission seat 5 is fixed on the axle 21. The permanent magnet motor3 is sleeved on the hollow shaft 4. One end of the hollow shaft 4 isconnected to the permanent magnet motor 3 through a flexible coupling 6,and the other end of the hollow shaft 4 is connected to the forcetransmission seat 5 through a flexible coupling 3.

In this embodiment, the flexible coupling 6 is preferably a laminatedcoupling. The laminated coupling includes a first driving disc 61, asecond driving disc 62, and a metal laminate 63. An inner sleeve 31 ofthe permanent magnet motor 3 is connected to the first driving disc 61.The first driving disc 61 is connected to one end of the hollow shaft 4by the metal laminate 63. The second driving disc 62 is connected to theother end of the hollow shaft 4. The second driving disc 62 is connectedto the force transmission seat 5 by the metal laminate 63.

In the flexible coupling 6, the metal laminate 63 may be replaced by asix-bar mechanism with rubber joints.

Both longitudinal sides of the cross beam 12 are provided withprotrusions 121. The outer contour of the cross beam 12 is of anoctagonal structure, and two outermost sides of the octagonal cross beam12 in the longitudinal direction are the protrusions 121.

The permanent magnet motor 3 is flexibly connected to the frame 1through a swing rod 7 and a suspension rod 17, one end of the swing rod7 is hung on the protrusion 121, the other end is connected to a housingof the permanent magnet motor 3, and the axis of the swing rod 7 isarranged longitudinally. One end of the suspension rod 17 is connectedto the housing of the permanent magnet motor 3, and the other end issuspended on the end beam 13. The permanent magnet motor 3 is laterallymovable.

A shock absorber 8 for damping out the vibration of the permanent magnetmotor 3 is arranged between the permanent magnet motor 3 and the endbeam 13. The angle between the axial direction of the shock absorber 8and the vertical plane is more than 0 degree and less than 90 degrees.

This embodiment further provides a rail vehicle, including a vehiclebody 9 and the above permanent magnet direct-drive bogie. A thirdtraction seat 123 is arranged at the bottom of the protrusion 121 oneach of the both longitudinal sides of the cross beam 12. The middle ofthe cross beam 12 is provided with a through hole 122.

The rail vehicle further includes a traction pin 15, two pull rods 16,and a fourth traction seat 94 arranged on the vehicle body 9. The fourthtraction seat 94 corresponds to the through hole 122.

One ends of the two pull rods 16 are respectively connected to the thirdtraction seats 123 in one-to-one correspondence, the other ends areconnected to the traction pin 15, and the two pull rods 16 arecentrosymmetric with respect to the traction pin 15.

The fourth traction seat 94 is inserted into the through hole 122 andconnected to the traction pin 15.

1. A permanent magnet direct-drive bogie, comprising a frame, a wheelset arranged on the frame, and a permanent magnet motor, wherein theframe comprises a longitudinal beam, a cross beam perpendicular to thelongitudinal beam, and end beams arranged at both ends of thelongitudinal beam; wherein a hollow shaft is sleeved on an axle of thewheel set, a force transmission seat is fixed on the axle, the permanentmagnet motor is sleeved on the hollow shaft, one end of the hollow shaftis connected to the permanent magnet motor through a flexible coupling,and the other end of the hollow shaft is connected to the forcetransmission seat through a flexible coupling; both longitudinal sidesof the cross beam are provided with protrusions; the permanent magnetmotor is flexibly connected to the frame through a swing rod and asuspension rod, one end of the swing rod is hung on the protrusion, theother end is connected to a housing of the permanent magnet motor, andthe axis of the swing rod is arranged longitudinally; one end of thesuspension rod is connected to the housing of the permanent magnetmotor, and the other end is suspended on the end beam; and the permanentmagnet motor is laterally movable.
 2. The permanent magnet direct-drivebogie according to claim 1, wherein the flexible coupling is a laminatedcoupling; the laminated coupling comprises a first driving disc, asecond driving disc, and a metal laminate; an inner sleeve of thepermanent magnet motor is connected to the first driving disc, the firstdriving disc is connected to one end of the hollow shaft by the metallaminate, the second driving disc is connected to the other end of thehollow shaft, and the second driving disc is connected to the forcetransmission seat by the metal laminate.
 3. The permanent magnetdirect-drive bogie according to claim 1, wherein the middle of the crossbeam is provided with a through hole.
 4. The permanent magnetdirect-drive bogie according to claim 3, wherein the outer contour ofthe cross beam is of an octagonal structure, and two outermost sides ofthe octagonal cross beam in the longitudinal direction are theprotrusions.
 5. The permanent magnet direct-drive bogie according toclaim 1, wherein a shock absorber for damping out the vibration of thepermanent magnet motor is arranged between the permanent magnet motorand the end beam, and the angle between the axial direction of the shockabsorber and the vertical plane is more than 0 degree and less than 90degrees.
 6. A rail vehicle, comprising a vehicle body, wherein furthercomprising the permanent magnet direct-drive bogie according to claim 1,the end beams comprise a front end beam and a rear end beam, and a firsttraction seat is arranged at the bottom of the rear end beam; thevehicle body is provided with a traction beam, and a second tractionseat is arranged at the bottom of the traction beam; and the firsttraction seat is connected to the second traction seat by a tractionrod.
 7. A rail vehicle, comprising a vehicle body, wherein furthercomprising the permanent magnet direct-drive bogie according to claim 1,a third traction seat is arranged at the bottom of the protrusion oneach of the both longitudinal sides of the cross beam, and the middle ofthe cross beam is provided with a through hole; the rail vehicle furthercomprises a traction pin, two pull rods, and a fourth traction seatarranged on the vehicle body, and the fourth traction seat correspondsto the through hole; one ends of the two pull rods are respectivelyconnected to the third traction seats in one-to-one correspondence, theother ends are connected to the traction pin, and the two pull rods arecentrosymmetric with respect to the traction pin; the fourth tractionseat is inserted into the through hole and connected to the tractionpin.